I have my Macbook connected to my Stadium XL via USB-C so I can play audio from my Mac out through my Helix. However, I can't find any way to control the level of the audio coming from the Mac. On the Mac, the volume controls don't do anything. The midi setup window doesn't allow me to control the output volume at all. Was it this same way with the Helix LT? I thought I at least had a volume slider in the midi setup for this connection, but I don't recall for certain.
It seems I can control the output volume from the fancy new Matrix view on the Stadium XL itself though.